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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.openssl.jcajce;

import java.security.Provider;
import java.security.SecureRandom;

import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.openssl.PEMEncryptor;
import org.bouncycastle.openssl.PEMException;

public class JcePEMEncryptorBuilder
{
    private final String algorithm;

    private JcaJceHelper helper = new DefaultJcaJceHelper();
    private SecureRandom random;

    public JcePEMEncryptorBuilder(String algorithm)
    {
        this.algorithm = algorithm;
    }

    public JcePEMEncryptorBuilder setProvider(Provider provider)
    {
        this.helper = new ProviderJcaJceHelper(provider);

        return this;
    }

    public JcePEMEncryptorBuilder setProvider(String providerName)
    {
        this.helper = new NamedJcaJceHelper(providerName);

        return this;
    }

    public JcePEMEncryptorBuilder setSecureRandom(SecureRandom random)
    {
        this.random = random;

        return this;
    }

    public PEMEncryptor build(final char[] password)
    {
        if (random == null)
        {
            random = new SecureRandom();
        }

        int ivLength = algorithm.startsWith("AES-") ? 16 : 8;

        final byte[] iv = new byte[ivLength];

        random.nextBytes(iv);

        return new PEMEncryptor()
        {
            public String getAlgorithm()
            {
                return algorithm;
            }

            public byte[] getIV()
            {
                return iv;
            }

            public byte[] encrypt(byte[] encoding)
                throws PEMException
            {
                return PEMUtilities.crypt(true, helper, encoding, password, algorithm, iv);
            }
        };
    }
}